Magnetic recording medium

Details Magnetic recording medium Magnetic recording medium

2006-01-31

2006-01-31

Resan, Stevan A. (Department: 1773)

Stock material or miscellaneous articles

Magnetic recording component or stock

Binder media

C428S844800

Reexamination Certificate

active

06991862

ABSTRACT:
In one aspect, the magnetic recording medium comprises a magnetic layer comprising a ferromagnetic powder and a binder and said binder comprises polyurethane resin having a glass transition temperature of 100 to 200° C. In a second aspect, the magnetic recording medium comprises a nonmagnetic layer comprising a nonmagnetic powder and a binder and a magnetic layer comprising a ferromagnetic powder and a binder in this order on a nonmagnetic support and at least the binder comprised in said magnetic layer comprises polyurethane resin having a glass transition temperature of 100 to 200° C. In both aspects, said magnetic layer has a thickness equal to or less than 0.15 μm, said ferromagnetic powder has a mean major axis length or a mean plate diameter of 60 nm or less, and said magnetic layer has a coercivity of 159 to 239 kA/m in a longitudinal or in-plane direction.

REFERENCES:
patent: 1022726 (2000-07-01), None
patent: 1207522 (2002-05-01), None

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